A Texas actress who authorities believe mailed poisonous letters to President Barack Obama and New York Mayor Michael Bloomberg has reached a plea agreement with federal prosecutors.

Shannon Guess Richardson, who police said tried to blame her husband for sending letters laced with ricin in May, has been charged with one count of making a threat agains the U.S. president and two counts of mailing and threatening communications, according to court documents.

The 36-year-old television actress faces up to five years in prison on each count. The terms of Richardson’s deal have not been made public.